Re: [PATCH RFC] sched/deadline: Use the revised wakeup rule for suspending constrained dl tasks

[Daniel Bristot de Oliveira]

On 04/24/2017 07:00 PM, Steven Rostedt wrote:
>> +static void
>> +update_dl_revised_wakeup(struct sched_dl_entity *dl_se, struct rq *rq)
>> +{
>> +	u64 density = div64_u64(dl_se->dl_runtime << 20, dl_se->dl_deadline);
> Hmm, dl_runtime and dl_deadline don't get updated that often. Can't we
> simply keep a static dl_se->dl_density, and update it when dl_runtime
> or dl_deadline get updated? That would get rid of the divide in the
> middle of a wake up call.

Yeah, I agree! Juri also pointed in the same direction, I will add it in
the possible next version ;-).

Thanks for the feedback!

-- Daniel